page loads into gadget frame when executing links with keyboard in FF 3.5 and IE7

When a link in a gadget (such as "Assigned to Me") has focus and then Enter is pressed to navigate to the linked page, the linked page opens inside the gadget frame instead of the full browser window.

IE 7
IE 8.0.7600.16385
FF 3.0.14
FF 3.5.4

This is especially problematic for users of Vimperator, and from an accessibility standpoint, as all navigation is performed via keyboard.